| In how many ways 3 letters can be posted in 4 letters boxes, if all the letters are not posted in the same letter box? |
A) 63
B) 60
C) 77
D) 81
Correct Answer: B
Solution :
| The number of ways in which three letters can be posted in 4 letter boxes \[={{4}^{3}}=64\]but it include the 4 ways in which all letters may be posted in same box. |
| Hence, required number of ways \[=64-4=60\] |
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